Decouple caching from layering and simplify everything

graphics/src/geometry/frame.rs

@@ -113,13 +113,11 @@ where
         region: Rectangle,
         f: impl FnOnce(&mut Self) -> R,
     ) -> R {
-        let mut frame = self.draft(region.size());
+        let mut frame = self.draft(region);
 
         let result = f(&mut frame);
 
-        let origin = Point::new(region.x, region.y);
-
-        self.paste(frame, origin);
+        self.paste(frame, Point::new(region.x, region.y));
 
         result
     }
@@ -129,14 +127,14 @@ where
     /// Draw its contents back to this [`Frame`] with [`paste`].
     ///
     /// [`paste`]: Self::paste
-    pub fn draft(&mut self, size: Size) -> Self {
+    fn draft(&mut self, clip_bounds: Rectangle) -> Self {
         Self {
-            raw: self.raw.draft(size),
+            raw: self.raw.draft(clip_bounds),
         }
     }
 
     /// Draws the contents of the given [`Frame`] with origin at the given [`Point`].
-    pub fn paste(&mut self, frame: Self, at: Point) {
+    fn paste(&mut self, frame: Self, at: Point) {
         self.raw.paste(frame.raw, at);
     }
 
@@ -187,7 +185,7 @@ pub trait Backend: Sized {
     fn scale(&mut self, scale: impl Into<f32>);
     fn scale_nonuniform(&mut self, scale: impl Into<Vector>);
 
-    fn draft(&mut self, size: Size) -> Self;
+    fn draft(&mut self, clip_bounds: Rectangle) -> Self;
     fn paste(&mut self, frame: Self, at: Point);
 
     fn stroke<'a>(&mut self, path: &Path, stroke: impl Into<Stroke<'a>>);
@@ -232,7 +230,7 @@ impl Backend for () {
     fn scale(&mut self, _scale: impl Into<f32>) {}
     fn scale_nonuniform(&mut self, _scale: impl Into<Vector>) {}
 
-    fn draft(&mut self, _size: Size) -> Self {}
+    fn draft(&mut self, _clip_bounds: Rectangle) -> Self {}
     fn paste(&mut self, _frame: Self, _at: Point) {}
 
     fn stroke<'a>(&mut self, _path: &Path, _stroke: impl Into<Stroke<'a>>) {}

graphics/src/mesh.rs

@@ -1,6 +1,6 @@
 //! Draw triangles!
 use crate::color;
-use crate::core::{Rectangle, Size, Transformation};
+use crate::core::{Rectangle, Transformation};
 use crate::gradient;
 
 use bytemuck::{Pod, Zeroable};
@@ -16,8 +16,8 @@ pub enum Mesh {
         /// The [`Transformation`] for the vertices of the [`Mesh`].
         transformation: Transformation,
 
-        /// The [`Size`] of the [`Mesh`].
-        size: Size,
+        /// The clip bounds of the [`Mesh`].
+        clip_bounds: Rectangle,
     },
     /// A mesh with a gradient.
     Gradient {
@@ -27,8 +27,8 @@ pub enum Mesh {
         /// The [`Transformation`] for the vertices of the [`Mesh`].
         transformation: Transformation,
 
-        /// The [`Size`] of the [`Mesh`].
-        size: Size,
+        /// The clip bounds of the [`Mesh`].
+        clip_bounds: Rectangle,
     },
 }
 
@@ -53,15 +53,15 @@ impl Mesh {
     pub fn clip_bounds(&self) -> Rectangle {
         match self {
             Self::Solid {
-                size,
+                clip_bounds,
                 transformation,
                 ..
             }
             | Self::Gradient {
-                size,
+                clip_bounds,
                 transformation,
                 ..
-            } => Rectangle::with_size(*size) * *transformation,
+            } => *clip_bounds * *transformation,
         }
     }
 }

graphics/src/text.rs

@@ -11,7 +11,7 @@ pub use cosmic_text;
 
 use crate::core::alignment;
 use crate::core::font::{self, Font};
-use crate::core::text::{LineHeight, Shaping};
+use crate::core::text::Shaping;
 use crate::core::{Color, Pixels, Point, Rectangle, Size, Transformation};
 
 use once_cell::sync::OnceCell;
@@ -50,7 +50,7 @@ pub enum Text {
         /// The size of the text in logical pixels.
         size: Pixels,
         /// The line height of the text.
-        line_height: LineHeight,
+        line_height: Pixels,
         /// The font of the text.
         font: Font,
         /// The horizontal alignment of the text.